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Near the drill bit local buck short

A near-drill, local technology, applied in the direction of drill pipe, drill pipe, drilling equipment, etc., can solve the problems of immature conditions for large-scale application, high equipment capacity requirements, and prone to well collapse, etc., to achieve simple structure and reduce breakage Intensity, the effect of increasing the drilling speed

Active Publication Date: 2017-06-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of this conclusion, underbalanced drilling (also known as negative pressure drilling, which refers to the drilling technology in which the bottom hole pressure is lower than the formation pressure during drilling, and the fluid at the bottom enters the wellbore in a controlled manner and circulates to the surface) has been adopted in the prior art. The rate of penetration has been greatly increased, and the formation damage has been reduced. However, this technology is only applicable to some formations, and this technology requires high equipment capacity, large investment, and is prone to risks such as well collapse and wellbore expansion. The conditions for large-scale application immature

Method used

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  • Near the drill bit local buck short
  • Near the drill bit local buck short
  • Near the drill bit local buck short

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Embodiment Construction

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0021] Such as figure 1 As shown, the near-drill local pressure-reducing short circuit 100 of the present invention includes an upper joint 1, a spiral upflow generator 2 and a lower joint 3 from top to bottom; the upper end of the upper joint 1 is open. In this embodiment, The inner wall of the upper end of the upper joint 1 is provided with a first connecting thread 13, and the upper joint 1 is connected with a drill collar (not shown in the figure) through the first connecting thread 13; the inner of the upper joint 1 is fixedly connected with a first torque transmission Block 4, the first torque transmission block 4 is provided with a first torque transmission through hole 41; the bottom of the upper joint 1 is provided with ...

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Abstract

The invention provides a near-bit local pressure reduction short joint which sequentially comprises an upper connector, a spiral rising flow generator and a lower connector from top to down. A first torque transfer block is fixedly connected inside the upper connector, and a second torque transfer block is fixedly connected inside the lower connector. The spiral rising flow generator comprises a transmission mandrel, a rotary outer sleeve and spiral blades, wherein the upper end of the transmission mandrel penetrates through and is fixed to a first torque transfer through hole formed in the first torque transfer block, the lower end of the transmission mandrel penetrates through and is fixed to a second torque transfer through hole formed in the second torque transfer block. A spiral section is arranged in the middle of the transmission mandrel and is sleeved with the rotary outer sleeve, and a screwing hole is formed in the rotary outer sleeve. The spiral blades are arranged on the outer wall of the rotary outer sleeve. The near-bit local pressure reduction short joint effectively reduces well bottom pressure difference, reduces hold-down effect and rock breakage strength and improves well drilling speed. In addition, the near-bit local pressure reduction short joint is simple in structure, convenient to use, safe and reliable.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a local depressurization short near a drill bit. Background technique [0002] In order to prevent blowout, traditional drilling is overbalanced drilling, that is, the drilling fluid pressure is greater than the formation fluid pressure and less than the formation fracture pressure. In order to ensure wellbore stability and avoid complex accidents, the density of traditional drilling fluid should be higher than the collapse pressure and pore pressure, and lower than the fracture pressure, so as to ensure that the wellbore does not collapse, blow out or leak. As the well depth increases, the drilling speed gradually decreases. There are two main reasons for this: 1. Under the action of the bottom hole fluid column pressure and the formation pore fluid pressure difference, the cuttings generated by the drill bit breaking the rock are pressed in place. Repeated cutting by the dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B21/00E21B17/04
CPCE21B17/04E21B21/00
Inventor 李士斌张立刚王昶浩官兵韩汝峰刘光贞司小东王海波
Owner PETROCHINA CO LTD
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